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<div><div class="header">
  <div class="headertitle"><div class="title">CMSIS-Compiler </div></div>
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<div class="contents">
<div class="textblock"><p><a class="anchor" id="mainpage"></a> <b>CMSIS-Compiler</b> provides software components for retargeting I/O operations in standard C run-time libraries. Following interfaces are supported for retargeting:</p>
<ul>
<li>File interface for reading and writing files.</li>
<li>I/O interface for standard I/O stream retargeting (stderr, stdin, stdout).</li>
<li>OS interface for multithread safety using an arbitrary RTOS.</li>
</ul>
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<img src="cmsis_compiler_overview.png" alt=""/>
<div class="caption">
Overview of CMSIS-Compiler</div></div>
    <p>Standard C library functions are platform independent, but the implementations of the low-level I/O and multithreading support are tailored to the target compiler toolchains.</p>
<h1><a class="anchor" id="autotoc_md0"></a>
Access to CMSIS-Compiler</h1>
<p>CMSIS-Compiler is maintained in a GitHub repository and is also released as a standalone package in CMSIS Pack format.</p>
<ul>
<li><a href="https://github.com/Arm-Software/CMSIS-Compiler"><b>CMSIS-Compiler GitHub Repo</b></a> provides the full source code of CMSIS-Compiler components.</li>
<li><a href="https://arm-software.github.io/CMSIS-Compiler/latest/"><b>CMSIS-Compiler Documentation</b></a> explains how to use the library and describes the implemented functions in details.</li>
<li><a href="https://www.keil.arm.com/packs/cmsis-compiler-arm/versions/"><b>CMSIS-Compiler Pack</b></a> delivers CMSIS-Compiler components and examples in <a href="https://open-cmsis-pack.github.io/Open-CMSIS-Pack-Spec/main/html/index.html">CMSIS-Pack format</a>.</li>
</ul>
<h1><a class="anchor" id="autotoc_md1"></a>
Key Features and Benefits</h1>
<ul>
<li>CMSIS-Compiler allows individual retargeting configuration for common I/O interfaces: file, stderr, stdin, stdout.</li>
<li>Implements several ready-to-use retarget variants: into File, Breakpoint, Event Recorder, ITM, as well as user-specific variant.</li>
<li>Supports common standard C libraries, such as from Arm Compiler and GCC (Newlib) toolchains. IAR support is planned.</li>
<li>Provides implementation templates and examples to get started. </li>
</ul>
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